Twyer for furnaces.



No. 698,485. Patented Apr. 29, I902., w. B. FOSTER. v

TWYEB FOR FURNACES.

(Application filed July 26, 1900.) (No Model.)

WITNESSES. I INVENTOR,

THE rmams ma; co; mum-Limo wmlks'rou. D, c.

UNITED STATES] PATENT OFFICE.

WILLIAM'E. FOSTER, on UTIGA, NEW YORK.

T W YER FoR FURNACES.

SPEUJIFIQATIQN forming part of Letters Patent No. 698,485, dated April29, 1902.

Application filed July 26, l 900.

To all whom it may concern.-

Be it known that I, WILLIAinB. Fos'rEE, of Utica, in the county ofOneida and State of New York, have invented certain new andusefullmprovementsinTwyers forFurnaces; and I do hereby declarethat thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the numerals of reference marked thereon,which form part of thisspecification.

The object of my presentinvention is to provide a twyer forblast-furnaces or cupolas having means or facility for inserting a barthrough the twyer-opening into the furnace to break a bridge formed inthe furnace.

Figure 1 shows a partial side elevation and a partial vertical sectionof a part of a blastfurnaoe including the features of my invention. Fig.2 shows a view taken at right angles from that in which the parts areshown in Fig. 1. Fig. 3 shows a side elevation, and Fig.4 a plan View,of a removable twyer plate, including twyer or blast-pipe.

Referring to the reference-figures in a more particular description, 1indicates the casing of a cupola or furnace, which is lined in the usualmanner witha lining 2 of fire-brick. The twyer-opening 3 is inclosed onthe outside by a casing 4E, surrounding the opening 3 and secured to thefurnace-shell. The casing 4is provided withan elongated upper wall and ashort lower or bottom wall 4?. The outer end of the twyr box or casing4: is closed by a door 5, which may be mounted on hinges and suppliedwith a catch, as shown. The tube 6 connects the twyer-box with ablast-blower or, some air forcing mechanism. For substantially closingthe end of the box or casing toward the furnace there is provided aremovable plate 7, having attached thereto a short section of pipe 8,which is the twyer or blast-pipe. i

It is a well-known fact that in furnaces, particularly those'of smallercapacity, and on long runs bridges of the fuel and material are liableto form in the furnace above the twyer-openings, which interfere withthe operation of the furnace. It is necessary or desirable to breakthese bridges, letting fuel in use. lower wall P of the twyer-box isreduced to substantially as shown by the dotted lines and indicated byA. After the bridge is broken the plate 7, with its blast-pipe, isreplaced and the door 5 closed. This opera tion can beperformed in a fewseconds without interfering with the operation of the furnace to anymaterial extent.

It will be noted that the twyer-opening through the wall of the furnacewhich I employ is of considerably larger proportions, particularlyvertically, than those heretofore This, together with the fact that thethe minimum, allows the bar to be inserted through the twyer-opening atquite an acute angle with the axis of the furnace.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination in a furnace of a twyer opening having a verticalextent equal at least to the thickness of the furnace-wall at thetwyer-opening, a plate for said opening removable without necessitatingthe removal of other coactin g parts and having a blast-opening andmeans for conducting the air to said blast-opening, substantially as setforth.

2., The combination in a furnace of a twyeropening andits surroundingcasing,said opening and casing being not less in vertical extent thanthe distance from the inner face of the wall of the furnace, to theouter edge of the bottom wall of the casing, a removable plate having ablast-opening, means for conducting the air to said blast-opening and'means for opening and closing the casing, substantially as set forth.

3. A furnace having a twyen-opening of a size to permit the introductionof a bar at an acute angle with the axis of the furnace, as set forth, aremovable plate for said twyeropening having a blast-opening therein anda movable without necessitating the removal of other coacting' parts,and having a blast-opening of smaller area than that of thetwyeropening, and means for conducting the airblast to saidblast-opening, substantially as set forth.

I In witness whereof I have aiiixed my signature, in presence of twowitnesses, this 24th day of July, 1900.

, WILLIAM B. FOSTER. Witnesses:

CHARLES G. IRIsH,

S. A. BROWN.

